Whereas PHPDocumentor would scan and generate all of the code in one go, DocBlox will scan the source code and generate a series of XML files based on the code it finds. It will then use these files to generate the API documentation in a number of different formats, although HTML is probably the most common.

He points out a few packages that you need to have installed before continuing (PHP-XSL, Graphiz, PEAR) and the commands you'll need to get it installed via the PEAR installer. He shows the commands to generate the documentation, how to install different template types and set up a configuration XML file.